本文介绍了CGEventTimestamp到NSDate的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我只是在尝试将CGEventTimestamp(这是一个无符号的64位整数，大致表示自系统启动以来的纳秒)，将其转换为NSDate.我知道有一种方法可以将自系统启动以来的时间"转换为NSTimeInterval或相对于参考日期的日期，但是找不到.
I'm simply trying to convert a CGEventTimestamp (which is an unsigned 64-bit integer roughly representing nanoseconds since system startup) into an NSDate. I know there's a way to convert "time since system startup" into either an NSTimeInterval or a date relative to a reference date, but I'm not finding it.
如何将CGEventTimestamp转换为NSDate将接受的内容?谢谢.
How do I convert a CGEventTimestamp into something NSDate will accept? Thanks.
(忘记提及，必须保持10.5友好，并尽可能避免使用Carbon)
(forgot to mention, needs to be 10.5 friendly and avoid Carbon if at all possible)
推荐答案
// Determine time in NSTimeInterval seconds this event took place after system start
GCEventTimestamp nanoseconds = GetIt();
NSTimeInterval seconds = (NSTimeInterval)nanoseconds / 1000000000.0;
// GetCurrentEventTime() gives you time in seconds since system start
EventTime currentTimeInSeconds = GetCurrentEventTime();
// Given this you can figure out the date of system start, and then add
// your event time
NSDate* startTime = [NSDate dateWithTimeIntervalSinceNow:-currentTimeInSeconds];
NSDate* eventTime = [startTime dateByAddingTimeInterval:seconds];
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